At a glance
Call of Duty 4: Modern Warfare (2007) has a Mac version: Steam sells it for macOS. The Mac requirements list only Intel: on Apple Silicon Rosetta 2 runs it, and old Mac versions sometimes do not start on current macOS. Try it in Steam for Mac first.
Call of Duty 4: Modern Warfare (2007) came out on Steam on 12 November 2007, made by Infinity Ward.
What your Mac needs
The Mac requirements list only Intel.
Minimum macOS in the Steam requirements: 10.12.
Steam requirements list at least 1 GB of memory for Call of Duty 4: Modern Warfare (2007).
How to play
Open Steam for Mac and install Call of Duty 4: Modern Warfare (2007) as usual.
If the Mac version will not start, you can install the Windows version through Uncork: download Uncork, sign in to Steam and install Call of Duty 4: Modern Warfare (2007) from there (8 GB). We have not tested it ourselves.
The Windows version through Uncork needs a Mac with Apple Silicon (M1 or newer).
Call of Duty 4: Modern Warfare (2007) uses DirectX 9.0c: Uncork renders it with its built-in graphics.